Feed-water heater.



No. 628,344. 1 Patented July 4, I899.

' H. A. MILLAR.

FEEDWATEB HEATER.

(Application filed Jan. 17, 1899.) (No Model.) 2 Sheets-Shaet I.

M? 6 ATTORNEYS.

mammals PEYERS ca. nnoYc-umo wunmo'ron D c No. 628,344. Patented July 4, I899. H. A. MILLAR.

FEED WATER HEATER. (Ajpiicution mm Jan. 17, 1899.) (No lloda l.) 2 Sheets-Sheet 2.

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'UNITED STATES PATENT OFFICE.

HENRY ALEXANDER MILLAR, OF BUENOS AYRES, ARGENTINA.

FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 628,344, dated July 4, 1 899.

Application filed January 17, 1899. Serial No. 702,443. (No model.)

To dZZ whom it may concern: Be it known that I, HENRY ALEXANDER MILLAR, a subject of the Queen of Great Britain, residing at 'Buenos Ayres, Argentina, have invented a new and useful Improvement in Boilers, of'which the following is a full, clear, and exact description.

The object of the invention is to provide certain new and useful improvements in boil ers, whereby the feed-water'heater forms a deflecting-arch for deflecting the heat arising from the burning fuel to the front of the firebox and at the same time highly heating the feed-water and causing a circulation of the water in the boiler through the feed-water device.

The invention consistsof novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a longitudinal sectional elevation of the improvement as applied to a locomotive-boiler, the section being on the line 1 1 in,Fig. 2. Fig. 2 is an inverted sectional plan View of the same on the line 2 2 in Fig,

1, and Fig. 3 is an enlarged transverse section of the same on the line 3 3 in Fig. 1.

A is the fire-box, B its exterior shell,'and C is part of the barrel of the boiler.

The feed-water heater consists of two tubular receptacles D D, closed at the ends and connected by two rows of tubes 61. It is supported upon studs a, projecting from the sides and back of the fire-box, or on water-tubes b, running from front to back of the fire-box in an inclined position corresponding with that usually occupied by the fire-brick deflectingarch.

A pipe E, which passes through the waterspace behind the fire-box to the receptacle D, has a branch E bent outward and upward to a valve-box e, where there is a valve governing a communication with the barrel of the boiler. Within the pipe E is another pipe F, also opening into the receptacle D, and havinga branch F passing outward and upward to a Valve-box f, where there is a valve governing a communication with the barrel of the boiler. The feed-pump G, which is supplied, as usual, by the pipe 9 from thetender or tanks, has its discharge connected by a pipe H to the box h, which communicates with f and contains a check-valve. From the receptacle D two pipes 01' d lead'up through the crown ofthe fire-box to the water-space above.

Instead of orin addition to the feed-pump Gan injectormay be employed communicating with the box It.

The apparatus operates as follows: The

valves in e and f being closed, the feed-water from the pump or injector, having passed the check-valve in h, flows by the branch F and pipe F into the receptacle D, thence through the tubes (1 to D, and thence up the pipes at (1 into the boiler, being heated on its way.

The valves in e and f being open, water can also pass from the barrel of the boiler through the heater to the space above the fire-box, so that thus there is a circulation of water through the heater. The circulation can go on whether the pump or injector is or is not at work. a

Two rows of tubes 61 are shown in the drawings, those of the upper row being over the spaces between those of the lower row, so as the better to obstruct passage of flame or gases directly upward. There might obviously be more than two rows of tubes d, andover these tubes there might be placed a baffleplate to prevent any passage of flame or gases between the tubes.

K is a blow-off pipe, having in aconvenient position a cock which can be opened to blow out deposit. The receptacles D D are also provided with screw-plugs It, which can be unscrewed when it is desired to wash out the heater.

Having thus described the nature of this invention and the best means I know for carrying the same into practical effect, Iclaim 1. The combination, with a boilerhaving a fire-box and a boiler-shell, of two tubular receptacles disposed transversely in the firebox, pipes extending between and engaging the receptacles with each other, a pipe leading from one receptacle upward to the boiler.- shell, a pipe communicating with the other receptacle and passing withoutthe boiler and having a branch extending upward at the outside of the boiler, a box with which said branch communicates, the box in turn communicating with the boiler-shell, an additional pipe extending through the pipe that is connected with the said other receptacle, the additional pipe passing out of the pipe in which it is contained upward to the side of the boiler-shell opposite the said branch pipe, a second box in communication with the said additional pipe and communicating with the boilershell, a pump, and a pipe extending between the pipe and one of the said boxes.

2. The combination, with a boiler having a fire-box and a boiler-shell, of a feed-waterheating receptacle mounted in the fire-box, a pipe leading from said receptacle to the wator-space of the boiler, a second pipe leading from the receptacle to a point without the boiler, a branch communicating with the second pipe and extending upward at one side of the boiler, a box with which said branch communicates, the box having communication with the water-space of the boiler, an additional pipe extending through said second pipe and projecting out of the same and upward at the side of the boiler opposite the said branch pipe, a box with which the said additional pipe communicates, the box having communication with the water-space of the boiler, a pump, and a pipe connecting the pump with one of the boxes.

3. In a feed-water-heating apparatus, the combination with a boiler, of a feed-waterheating receptacle mounted in the fire-box, a pipe in the fire-box and serving to connect the said receptacle with the steam-space of the boiler, a second pipe communicating with the heating-receptacle and passing outside of the boiler and having a branch leading upward to and communicating with the boiler, and a third pipe situated within the second pipe and communicating with the heating-receptacle, the third pipe having a branch passing out of the second pipe and leading upward to and communicating with the opposite side of the boiler.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses,

HENRY ALEXANDER MILLAR.

\Vitnesses:

WILLIAM GRAHAM LLOYD, SAMUEL CLAYTON WETZEL. 

